Open MPI currently does not fully support a proper disconnection of
parent and child processes. Thus, if a child dies/aborts, the parents
will abort as well, despite of calling MPI_Comm_disconnect. (The new RTE
will have better support for these operations, Ralph/Jeff can probably
give a better estimate when this will be available.)

However, what should not happen is, that if the child calls MPI_Finalize
(so not a violent death but a proper shutdown), the parent goes down at
the same time. Let me check that as well...